Plastic Fluid 1
Plastic Fluid 1 : A complex, non-Newtonian fluid in which the shear force is not proportional to the shear rate. A definite pressure is required to start and maintain movement of the fluid. Plug flow is the initial type of flow and only occurs in plastic fluids. Most drilling fluids are plastic fluids. The yield point as determined by direct-indicating viscometer is in excess of zero. (Bul 10C, Bul D11)
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